problems with marks on leaves

[Dov1 1,072]

So im on day 71 and feeding this auto white widow 4L of nute water with 0.5ml of biobizz grow and 4ml of biobizz bloom per litre, theyre in soil and have a good wet dry cycle, i cant work out this problem!  Tenps are between 18 and 28c and humidity is between 38 and 60 and its under a 250w hps 10inchs away from tips.

 

I have no clue whats causing these leaf mark and cant find them on any charts 

 

 

Here is the whole plant

 

Help is appreciated!

[Dodgee 56,194]

Moved to sick plants as requested 

[Shumroom 20,777]

Your low temp and low humidity might not be helping¿

 

[Dov1 1,072]

18 hours ago, Shumroom said:

Your low temp and low humidity might not be helping¿

 

Temps i get, i thought humidity needed to be low during flower? 

[Shumroom 20,777]

Most people have low rh to try to avoid mold, 

but such low humidity isn't ideal for the plants. 

For 28°C I'd look to have humidity around 60% 

Make sure you still have plenty of air flow and keep the humidity lower at lights off, 

this is when my rh usually rises. 

 

Hope this helps,

it could be something else though?